Thankyou for quick response
Have created en empty error.log file and put it in /public_html
Here is amended .htaccess file
RewriteEngine On
php_flag log_errors on
php_value error_log /home/derwent/public_html/error.log
RewriteCond %{REQUEST_FILENAME} -s [OR]
RewriteCond %{REQUEST_FILENAME} -l [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^.*$ - [NC,L]
RewriteRule ^.*$ index.php [NC,L]
Have refreshed page but there nothing in log file.
Also tried refresh without empty error.log but no log file created.
Thanks Michael